Fuel supply system for burners



March 3, 1942. H, MUELLER 2,275,267

FUEL SUPPLY SYSTEM FOR BURNERS Filed Aug. 30, 1940 2 Sheets-Sheet ATIORNEYS March 3, 1942. E. H. MUELLER FUEL SUPPLY SYSTEM FOR BURNERS Filed Aug. 30, 1940 i 2 SheetsSheet 2 INV .Erwm /7 Ma ATTORNEYvS Patented Mar. 3, 1942 Application August 30, 1940, Serial No. 354,910

2 Claims. (01. 15811'l.1)

This invention relates to an arrangement invclving controlling valves for supplying fluid fuel to burners.

The invention is concerned particularlyfwith 'the provisionof an arrangement for supplying gaseous fuel in installations commonly used in mild climates where the so-called floor burners are employed. In my. application Serial No. 346,- 739, filed July 22, 1940, a control valve for a floor burner is disclosed, and a valve of this nature can be employed in the present system. The floor burner is an arrangement usually suspended from the ground floor for burning gaseous fuel,

and the-control is efiected by the'operation of valves from above the floor.- The general object of the invention is to provide an improved arrangement and system embodying but two control valves for controlling the flow of fuel to the burner and pilot, and also for preventing escape of gaseous fuel in the event the pilot flame becomes extinguished, but wherein the pilot flame may be temporarily supplied with gas for reignition.

An arrangement for carrying out theinvention is disclosed in the accompanying drawings.

'Fig. 1 is a plan view of a system or lay-out for carrying out the invention.

Fig. 2 is an enlarged cross sectional view taken through the main control valve substantially on line 22 of Fig. 1.

Fig. 3 is a similar enlarged cross sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a cross sectional view of the contr valve for the pilot flame.

Fig. 5 is a view similar to Fig. 4 showing modified form of pilot control valve.

Fig. 6 is a cross sectional view taken substantially on line 6-6 of Fig. 2 through the cap 01 the main control valve showing difierent positions of the valve.

Fig. 7 is a sectional view taken substantially on line 11 of Fig. 2 showing positions corresponding to the Fig.6 positions. I

Fig. 8 is asectional view taken substantially on line 8-8 of Fig. 2 showing a position corresponding to that of Figs. 6 and '7.

Fig. 9 is a cross sectional view similar to Fig. 8 illustrating another position as indicated by the dotted lines of Figs. 6 and 7.

Fig. 10 is a cross sectional view similar to Fig.

6 illustrating other positions of the control valve. Fig. 11 is a view similar to Fig. 7 showing the positions of the main fuel supply corresponding to the positions shown inFig. 10.

Fig. 12 is a viewsimilar to Fig. 8 illustrating the pilot flow ports corresponding to the positions shown in Figs. 1-0 and 11.

Fig. 13 is a view similar to Fig. 12 illustrating another position of the pilot flow ports.

-In Fig. 1 a gassupply line is shown at l for supplying gas to a burner 2 and in the line is a thermostatically controlled shut-oil device or valve diagrammatically illustrated at 3 controlled by a thermocouple lead 4 subject to the pilot flame. Another automatically acting and thermostatically. controlled valve or shut-oil device is shown atiiwhile the main valve for the burner is generally illustrated at 6.- A conduit"! for the gaseous fuel for the pilot by-passes the thermostaticdevice 5, enters the main valve as at 8 and passes out at 9 through a pilot starter valve I0 flame of. which is illustrated at I3. It will be noted that the thermocouple lead 4 is positioned to be heated by the pilot flame. An auxiliary gas supply by-passes both the thermostatically acting valves 2 and 4 as by means of conduit I 5 entering the valve III as at is. j

The valve III, as shown in Fig. 4, has a chamber 20 closed by a cap 2|, and the line sections 9 and II are connected directly through this chamber. The inlet and outlet ports are shown at l9 and 22. The'line i5 entersinto a passage 23 which is closed by a disc valve 24 acted upon by a spring 25. A pin 26 connectsto the disc valve and is slidably posltionedin the body l0 and is provided with a cap 29. A spring 21 may surround the pin and also serves to close the valve 24,- and the pin may pass through a suitable packing 28. The valve 24 and packing. 28 may be of rubber or synthetic rubber.

The main valve 6 has a tapered valve plug 30 with a port 3| 'therethrough for completing the main supply line. The plug also has a passage 32 for the pilot fuel which passes through the plug at right angles to the passage 3|, and as best shown in Fig. 8 the ends of the passage are provided with arcuategrooves 33. The valve may be held upon its seat by a spring 34.

The control for the valve is the same as that stops 5. and BI as shown in Fig. 6. When the valve is turned off the pin abuts stops 52 and is supplied to the pilot. This is the normal condition during the operating period. The stops 52 and 53 do not extend all the way down to'the valve body as shown in Figs. 2 and 3, with the result that the cross pin 42 may be pushed downwardly against the action of the spring 44 by the rod 40, and then the valve turned to position the cross pin on the opposite sides of the stops 52 and 53 as shown in Fig. 10. with the pin abutting against stops illa and m, as shown in Fig. 10, then both the main supply of fuel and the pilot supply of fuel is turned oil, as illustrated in Figs. 11 and 12. This is the normal complete "01? position for the long season when no heat is required. When the valve is turned to position the cross pin against the stops 52 and 53, as shown by the dotted line positionof Fig. 10,

then fuel for the pilot is supplied through the arcuate passages and passage 32, as these pasfuel lines are closed. By turning the valve to.

the dotted line position shown in Fig. 10, the pilot may be ignited. Then during the operating season the valve may be positioned so that the pin operates between the stops shown in Fig. 6, with the main burner off when the cross pin is against this condition fuel is supplied to the valve II through the line I! but it is closed by the valve 24. An operator may push on the cap 29 to open the valve 24 to thus supply fuel to the pilot for its ignition, and when the heat therefrom has caused the thermostaticvalve 3 to open, the cap 29 may be released to close valve 24 and the pilot fuelis supplied in the usual manner. Thus, a single valve and a single conduit to the pilot (the conduit ll) furnishes the normal fuel for the pilot flame and the auxiliary temporary fuel to ignite the pilot flame. 'The valve 24 must be opened to initially ignite the pilot flame at the start of the operating season.

A modified form of starter valve is shown in Fig. 5 where the same reference characters are used with the addition of the letter a. This valve is of the same basic structure as the valve shown in Fig. 4, but instead of a sealing disc or washer 24, it is provided with a tapered valve plug mem- 5 her 24a arranged to seal against a tapered seat the position shown in Fig. 5.

I claim: I I 1. In a' fuel supply system for a burner of fluid fuel, the combination of a fuel supply line, a'

' burner, a pilot burner, a main control valve in i5 the supply line for controlling the supply of fuel to both the said burner and pilot burner, there being asingleconduit for supplying fuel to the pilot burner, a thermally controlled shut-oil! valve positioned in the suppl line upstream from the control valve and operated from the heat of the pilot flame, whereby, when the pilot flame is extinguished, the thermally controlled valve closes, a starter valve between the main valve and the said single conduit for. the pilot burner,

sa-and which is normally open for the passage of fuel from the control valve to the pilot burner, a second conduit connecting into the supply line I upstream of said thermally controlled valve and leading into the starter valve, saidstarter valve having passage means for connecting the second conduit with the said single conduit, means normally closing said passage. and means operable to open said passage for the supply of fuel to the pilot burner subsequent to the closing of the thermally controlled valve.

2. In a fuel supply system for a burner of fluid .fuel, the combination of a, fuel supply line, a

.burner, a pilot burner, a control valve in the n supply line, a thermostatic shut-oi! valve in the the stops 52 and 53, and on when the cross pin 3 supply line upstream froni the control valve, means for supplying fuel to the pilot burner including a by-pass conduit connected into the supply line upstream fromthe thermostatic valve and leading to the control valve-and a' single conduit leading from the control valve to the pilot burner, a starter valve between the control valve and the pilot burner normally open for the flow of fuel to the pilot burnerfrom the control valve, a thermally controlled shut-off valve in the sup- W ply line positioned upstream from the by-pass conduit and controlled by the heat of the pilot flame, an auxiliary conduit connecting into the supply line upstream from the thermally controlled shut-ofl valve and connecting into the 5 starter valve, said starter valve having passage means for connecting the auxiliary conduit with the said single conduit, a valve member in the starter valve normally closing said passage, and means operable to shift said valve member to open said passage for the supply of fuel to the pilot burner when the thermally-controlled valve is closed.

v ERVIN H. MUM-ER. 

